Valve mechanism for gas-engines.



' PATBNTED MAR'. '27

No. 816,047..4 y

` C. M.'SMITH 6; S. B. WELCOME. M FOR GAS ENGINES. ILBD JAmlz, 1905.

.VALVE MBOHANIS' APPLICATION? 4 Y I a sHnETssHnnT a;

Selilflllww To all. whom it may-concern! and lSOLON BYRON WELCOME', citizens 'of the4 United States,residingat Los An eles, inthe county of Los Angeles and State o California,- have i-nvented a new and useful Valve Meo'hiCassius M SMITHQAND SOLON BYRO'NwELoOMn OF Los ANGELES, i

WESTERN iRON, WORKS, AVLOORPORA- p CALIFORNIA, fASSIGrlTORS T O;

v. TION OECALIFORNIA.

fNo. 816,047.

` Be it known that we, Cassius M. 'Stirrn 'anism for Gras-Engines,v of which'the followlingris a specification..I

, V8, Ves.

his invention relates torthat type' of gasenl ines which. have mechanicall erated In, the present case botld` and outlet valves are mechanically'factuated and the main object ofthe invention is to provide a vnovel means for actuating the inlet andoutlet valves and for" controlling the operation of said valves in such manner as toV secure aconstant speed of the engine.

, fsure within the cylinder while thecrank-shaft i v vention Wil Another object of the invention is to provide means for yplacing the 'valve-operating mechanism in such condition 1 that the exhaust will? be partially opened automatically asV the crank-shaft is turned to reduce presis bein `turned in y`starting upthe engine, hus a owing the engine" to be easily started by hand.

' y Another object of the inventionis to' rovide a mechanism of the character'descrlv ed 'which is simple in construction effective 1n .so

operation, and, very com' act iniorm. p

Other ob'ects and a vantages ofthe ini appearrom the following descri tion.`

l `e accompanyingv drawings illustrate. the invention;

Referring to the drawings, Figure 1 isa side elevationpf anenginefequipped with the valvemechanism forming the present 1n'- vention, showingfthe. parts in Aone position.

Fig. 2 is a view similar toFi 1 theengine- -frame being removed, showing the parts 1n another osit'ion. Fig. 3 isa. plan viewof y what is s own in-Fig. -1.,` Fig. 4 4isa view showing vthe reverse side 'of the mechanism in Fig. 2, except that the overnor and valvechamber-of the engine avebeen removed.-

Fig. '5 isa section on the line XX in-Fig. 1.

, Fig. 'l 6 visa", perspective of the .eccentric'g and i sdshowingt which 'isp ovided with a`cylinde'1 2 ,andfcrankt e inlet' tes. the main -rame' oigan engine,

necting-rod 5, o erated by the usual iston y(not s own) wit `n the' cylinder 2." stud forming a stationary cam-shaft 6 is mounted J, on the main frame l", as shown in Fig. 5,- and journaled thereon is an. eccentric? ,carrying -a rimary camS and a secondarycamjQ; A

gear 10, which meshes with a .pinion 11, mounted Onthe crank-shaft 3,. An eccentriced on' the eccentricl 7', is'rigidlyconnected to oted at to aslide-headv 16,"which is s idably mounted in ways 1 7 formed, preferaibly,

may comprise a pump for maintaining water circulation and maybebolted to the main frame 1 in an-y suitable manner.

Attached to Y'thev cylinder. 2y is av valveinder ma have a suitable water-jacket, andv kthe circu ation therethrough may be obtained 'by means vof the ump 1'8, which is connected head 16. Fuel may be supplied to the valveber. `form a .generally mentioned.-V l

Mounted withinzthe upper. partof :the

a stem 26. The inlet-valve is resiliently pressed upwardly againsta 'conical seat by vmeans -o a' coilspring `27, inter osed lbeber, and a flange 29on'thestem 26.`

valve-chamber and bears upon the to' 'of the rejecting upwardly from the slide-head 16.

head 12, having an eccentric-strap 13 mountchamber from a pump- 22, the c linder of' which ma be formed on the endo the'slidepart of this invention, they are but vvalve-stem 26. The other -arnr of t` ebell-f -crank lever30 has ivoted thereto an'operat- 'ing-rod 33, with 'a v00h34, which normally lies in thepath ,of movement of abos's 35,v

Ravenna naaien 21,1906.

4, thecrankshaft being driven bya; coni 6, igidly attached to thefeccentric l7 -is a l an eccentric-rod 14, the end-o-which is ivkintegral with'a cylinder 18. Thecylinder 18 chamber 1.9. The valve-chamber and c'ylwith a water-jac et by a pipe 20 and is operi ated by a piston-rod 21, carried by the shde vconductingfuel therefrom to th??l va vecham As the water and-fuel pumps do not s valve-chamber 19 is an inlet-valve 25, having tween a spider 28, formedin theva ve-'eharn- .A bell-crank lever SOis pivoted' to'a bracket i 31.and has an arm 32, which extends Ainto Ithe roo . ies llhusas' the engine operates and, the slidev p f u 4.4 and oscillates the rock-lever 36. The

head 16 moves'toward the vcrank-shat'tthe boss 35 'engages the hook 34 and draws the o erating-rod 33 along with it, thus tilting t e bell-crank lever 30, the arm 32 of which, pressing down upon t-he-` valve-stein 26., depresses and opens the valve 25. li pon the reverse stroke the operating-rod 33 retracted along with the slide-head 16 through the medium of the bell-crank lever 30, which is returned by the upward movementl ol' the valve-stem 26, produced by the coil-spring27.

A rock-lever 36 is pivoted at 37 to the main frame 1 and is connected by a link 38 with the operating-rod 33.

An exhaust-valve 39 ismounted within the valve-'chamber 19 and is rovided with a valve-stem 40 and isnormal y helddepressed and in its conical seat by means of a coilspring 41, which bear-iv against a, flange 42. The lower end of the valve-stein 4() bears against the end of the rock-lever 36. The rock-lever 36, near its other end, carries a lstud .43, upon which is mounted a roller 44,

which lies under the primary cani 8, so that as the latter revolves it acts upon the roller ratio of the pinion 11 to the gear 10 is one to two, so that the gear 10 andthe cam S are given one complete revolution to every two revolutions ofA the crank-shaft 3, the engine being a four-cycle engine. As the rock-lever 36 is oscillated it causes the opening and closing of the exhaust-valve IQ, opening the valve ositively by `iessiiig upward against the va ve-stem 40, the valve being closed by the expansion of the coil-spriiig 41 d uring the return movement of the rock-lever. During the intake-stroke of the piston the inlet-valve 25 is opened through the medium of the slidehead '16, operating-rod 38, and bell-crank lever 3U, and during the ret-urn stroke or compression-stroke the inlet-valve is closed, and the exhaust-valve 3) is also closed. After -the explosion as the. piston moves through its .working stroke the valves remain closed; but at the end of the working stroke the cam 8 moves against the roller 44 and t-ilts the rock-lever 36, opening the civhaust-valve 39 and holdingit open during the exhaust-stroke, the face of the cani S being concentric with the shaft 6 and ext ending through approximately one-quarter of a circle, so that at the end of the exhaust-stroke the cam 8 moves off from the roller 44 and f ing longitudinal slots 46, through which boltsl allows the spring 41 toexpand, which closes the exhaust-valve 39 and restores the rocklever 36 toits original iosition.

In order to relieve the pressure within the cylinder to'allow the engine to be more readily started by hand in securingl initial conipression, ashde-bar 45 is provided, which is slidablv mounted on the rock-lever 36. hav- 47 pass, which are. screwed into the rock-lever 36. Spring-pressed washers 48 are provided for frictionall)v holding the slide-bar in position on the rock-lever 36.' One end oll the slide-bar 45 has a handle 49, b v means of which it may be moved into either of its positions oii the rock-lever. By pushing the slide-bar 45 toward the shaft 6 its end is brought iuider the sweep ol the sccondacv cani t), so that when the engine is being started by hand as the cams 8 and E) rotaie the rock-lever 36 is actuated and the exhaustva-lve is opened during the regular exhaustystroke by the operation of the cam S acting upon roller 44 and is also opened slightly during the compression-stroke by means of the cam 9 pressing down upon the end ol the slide-bar 45, as illustrated yin Fig. 4, thus relieving the compression to a considerable degree. When the slide-bar -15' is manually slid from under the cam 9, the latter ceases to tilt the rock-lever 36, and the latter is then operated regularly by the cam 8 and is not given the interinittent short tilt by the cani 9. 'I he end of the rock-lever 36 has a toe 50, with a notch 51, which is adapted to engage a detent 52, which forms part of a governing mechanism which includes a centrifugal-acting semicircular weight 53, pivoted to the i'iywheel 4, asshown in Fig. 1, the sensitiveness of "ts movement being regulated by an adjustable spring device 54. The detent 52 is pivoted to a stud 55 and has a-shoe 56, over which the curved weight 53 is adapted to ride. Vith the adjustment properly made while under a load and at a normal speed the weight 53 lies free from the shoe 56, and upon a decrease of the. load on the engine oi for any other cause which produces a higher speed in the engine the weight 53 swings out and actingy upon the shoe 56 tilts the detent 52 into a position in which it will engage the notch 51 and result in holding the rock-lever 36 in the position shown in Fig. 2, which keeps the exhaust-valve open, and by reason of t-he o )erating-rod 33 being also raised the inlet-valve 25 is retained closed by means of a coil-s ring 27. Thus admission of fresh fuel to tie explosion-chamber is prevented until the speed of the engine is reduced sullicientlv to release the detent 52 and allow the rock-lever 36 to resume its normal operation. 'lhe igniting device 57 may be actuated by an operating-rod 5S, pivoted to the boss 35.

While we have shown and described the preferred embodiment of this invention, it should be understood that various changes and modifications may be made without departing from the scope of the invention.

What v claim' is- 1. In a gas-engine, an inlet-valve, an outlet-valve, a bell-crank lever for operating the i inlet-valve, an operating-rod pivotcd to thel bell-crank lever and having a hook on its end, a slide-head having an eccentric operated by the engine, an eccentric-rodconnecting the slide-head and eccentric, a primary cam car- IOO ri-ed by @amil-wie, a; pivtea rofikzi'ver' o erated bythe primary. cam fo'r actuating erable lwhen starting vthe. engine for autornctcannj v 2. In a gasfengine, en inletfvalve, an outi i a'slide-head having means lfor engaging sa h'ook; an eccentric operatedby. the-engine, an

lcverl sind the' operating-rod, means carried :by the' eccentric for. Eeratingj-the rockshaft inlet-valve let-valve, abell-crank leverfor operating the' 1an f 'operating',-r'od, pivtel atot the` verand having .a hook onithsfe'nd bell-crank .eccentric-'rod vconnectin `the' `s1ide7hcada,ndf eccentric, apiv'oted roc I-levei` for 'faictuetthe eXhaust-,valve,1& link connecting the' rocklongand shor-t' stro esjalternately when starting the engine, andl means for.,restricting` anyinlet-valve,4 anout. le'tfvalve,. cbell-cranl( lever for operating the f .5 inlet-vlvqan operatingrod-pivotedto the L j.A

- beu-crank levmnd havinga'hk n if's'e'nd,

n l y l a slide-head having a; boss forengagng smidl 't ye exhaust-valve, elink connecting the rockh e lever and. sind'1operating-r.od,4 vend means i opook, fan eccentric-.rod connecting .t slidehead and eccentric,' crock-lever with .operative connection' With'lboth the-.tletevalve end operating-rod, vaiilxnecns carried by lthe Y eccentric for actuating v.the rock-lever. l A

yIn, a'gas-e'n inc,aninletvalve,an'outr v .35`

l 14': let4val-ve,` means or' orating thcinletavnlve, Inekmis' for operating't 4e exhaust-valve', a' de- *vicel Operated by yscid last me'ansfolt intere 4 lnikst'ar1-tl3f rendering vlthe first means inopera- -tive and manually-cntrolled vmeans for ausur'e in the cylinder. .f

In testimony whereof VVWe,111cv'e, he'relintol "set our hands, at Los Angeles ,l' California, this *Wmatfll ,-I-Ecrting 7a secondary movie- 'y ment to t 'ce 'cust-valve Valternating-vvitlr.

- -its regular movement for relieving. the pres.

.RON zWELc'oi'na` i f 

